کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4419334 1618935 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lettuce irrigated with contaminated water: Photosynthetic effects, antioxidative response and bioaccumulation of microcystin congeners
ترجمه فارسی عنوان
سالاد آب آلودگی با آب آلوده: اثرات فتوسنتزی، پاسخ آنتی اکسیداتیو و ذخیره سازی زیستی مشتقات میکرو سستین
کلمات کلیدی
فتوسنتز، آلودگی مواد غذایی، سلامتی انسان، میکروستیزین، استرس اکسیداتیو
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


• Lettuce was irrigated with microcystins (MCs) contaminated water.
• Photosynthetic rates and other gas exchange parameters were significantly altered.
• Protein content and antioxidant enzyme activities were significantly affected by MCs.
• Variation of MCs bioaccumulation factor depended on exposure level and congener type.
• Due to accumulated levels, irrigation with MCs contaminated water poses a health risk.

The use of microcystins (MCs) contaminated water to irrigate crop plants represents a human health risk due to their bioaccumulation potential. In addition, MCs cause oxidative stress and negatively influence photosynthetic activities in plants. The present study was aimed at investigating the effect of MCs on photosynthetic parameters and antioxidative response of lettuce. Furthermore, the bioaccumulation factor (BAF) of total MCs, MC-LR and MC-RR in the vegetable after irrigation with contaminated water was determined. Lettuce crops were irrigated for 15 days with water containing cyanobacterial crude extracts (Microcystis aeruginosa) with MC-LR (0.0, 0.5, 2.0, 5.0 and 10.0 µg L−1), MC-RR (0.0, 0.15, 0.5, 1.5 and 3.0 µg L−1) and total MCs (0.0, 0.65, 2.5, 6.5 and 13.0 µg L−1). Increased net photosynthetic rate, stomatal conductance, leaf tissue transpiration and intercellular CO2 concentration were recorded in lettuce exposed to different MCs concentrations. Antioxidant response showed that glutathione S-transferase activity was down-regulated in the presence of MCs. On the other hand, superoxide dismutase, catalase and peroxidase activities were upregulated with increasing MCs concentrations. The bioaccumulation factor (BAF) of total MCs and MC-LR was highest at 6.50 and 5.00 µg L−1, respectively, while for MC-RR, the highest BAF was recorded at 1.50 µg L−1 concentration. The amount of total MCs, MC-LR and MC-RR bioacumulated in lettuce was highest at the highest exposure concentrations. However, at the lowest exposure concentration, there were no detectable levels of MC-LR, MC-RR and total MCs in lettuce. Thus, the bioaccumulation of MCs in lettuce varies according to the exposure concentration. In addition, the extent of physiological response of lettuce to the toxins relies on exposure concentrations.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 128, June 2016, Pages 83–90
نویسندگان
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